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INTERNET PROTOCOL ADDRESS SPACE
The allocation of Internet Protocol version 6 (IPv6) address space to
various uses listed here [RFC2373].
Allocation Prefix Fraction of
(binary) Address Space
------------------------------- -------- -------------
Reserved 0000 0000 1/256
the "unspecified"address 0:0:0:0:0:0:0:0 [RFC1970]
Unassigned 0000 0001 1/256
Reserved for NSAP Allocation 0000 001 1/128
Reserved for IPX Allocation 0000 010 1/128
Unassigned 0000 011 1/128
Unassigned 0000 1 1/32
Unassigned 0001 1/16
Unassigned 001 1/8
Provider-Based Unicast Address 010 1/8
Multi-Regional (IANA) 010 10000 1/256
Europe (RIPE-NCC) 010 01000 1/256
North America (ARIN) 010 11000 1/256
Asia-Pacific (APNIC) 010 00100 1/256
IPv6 Testing Address Block 010 11111 1/256 [RFC1897]
Unassigned 011 1/8
Reserved for Geographic-
Based Unicast Addresses 100 1/8
Unassigned 101 1/8
Unassigned 110 1/8
Unassigned 1110 1/16
Unassigned 1111 0 1/32
Unassigned 1111 10 1/64
Unassigned 1111 110 1/128
Unassigned 1111 1110 0 1/512
Link Local Use Addresses 1111 1110 10 1/1024
link local FE80 [RFC1971]
Site Local Use Addresses 1111 1110 11 1/1024
site local FE90
Multicast Addresses 1111 1111 1/256
An IPv6 multicast address is an identifier for a group of nodes. A
node may belong to any number of multicast groups. Multicast
addresses have the following format:
| 8 | 4 | 4 | 112 bits |
+------ -+----+----+---------------------------------------------+
|11111111|flgs|scop| group ID |
+--------+----+----+---------------------------------------------+
11111111 at the start of the address identifies the address as
being a multicast address.
+-+-+-+-+
flgs is a set of 4 flags: |0|0|0|T|
+-+-+-+-+
The high-order 3 flags are reserved, and must be
initialized to 0.
T = 0 indicates a permanently-assigned ("well-known")
multicast address, assigned by the global internet
numbering authority.
T = 1 indicates a non-permanently-assigned ("transient")
multicast address.
scop is a 4-bit multicast scope value used to limit the scope
of the multicast group. The values are:
0 reserved
1 node-local scope
2 link-local scope
3 (unassigned)
4 (unassigned)
5 site-local scope
6 (unassigned)
7 (unassigned)
8 organization-local scope
9 (unassigned)
A (unassigned)
B (unassigned)
C (unassigned)
D (unassigned)
E global scope
F reserved
group ID identifies the multicast group, either permanent or
transient, within the given scope.
So here we assign only the group ID part of the address (the low
order 112 bits).
all-nodes FFxx:0:0:0:0:0:0:1 [RFC1970]
all-routers FFxx:0:0:0:0:0:0:2 [RFC1970]
all-rip-routers FFxx:0:0:0:0:0:0:9 [RFC2080]
all-cbt-routers FFxx:0:0:0:0:0:0:10 [Ballardie]
reserved FFxx:0:0:0:0:0:1:0 [IANA]
linkname FFxx:0:0:0:0:0:1:1 [Harrington]
all-dhcp-agents FFxx:0:0:0:0:0:1:2 [Bound]
all-dhcp-servers FFxx:0:0:0:0:0:1:3 [Bound]
all-dhcp-relays FFxx:0:0:0:0:0:1:4 [Bound]
solicited-nodes FFxx:0:0:0:0:1:0:0 [RFC1970]
multicast address FFxx::1:0:0 to FFxx::1:FFFF:FFFF
Note: The "unspecified address" the loopback address, and the IPv6
Addresses with Embedded IPv4 Addresses, are assigned out of the 0000
0000 format prefix space.
REFERENCES
[RFC2373] Hinden, R., and S. Deering, "IP Version 6 Addressing
Architecture", RFC 2373, Nokia, Cisco systems,
July 1998.
[RFC1897] Hinden, R., and J. Postel, "IPv6 Testing Address
Allocation", Ipsilon Networks, ISI, January 1996
[RFC1970] Narten, T., E. Nordmark, and W. Simpson, "Neighbor Discovery
for IP Version 6 (IPv6)", RFC 1970, IBM, Sun Microsystems,
Daydreamer, June 1996.
[RFC1971] Thomson, S., and T. Narten, "IPv6 Stateless Address
Autoconfiguration", Bellcore, IBM, June 1996.
[RFC2080] Malkin, G., and R. Minnear, "RIPng for IPv6", RFC 2080,
Xylogics, Ipsilon Networks, January 1997.
[Ballardie] Tony Ballardie, <A.Ballardie@cs.ucl.ac.uk>, February 1997.
[Harrington] Dan Harrington, <dth@lucent.com>, July 1996.
[]
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